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Spuriously high free thyroxine with the Amerlite MAB FT4 assay.
  1. L C Lai,
  2. J A Day,
  3. F Clark,
  4. R T Peaston
  1. Department of Clinical Biochemistry, Freeman Hospital, Newcastle upon Tyne.

    Abstract

    In the Amerlite MAB FT4 assay, as stated by the manufacturer, FT4 values should be normal in patients with anti-thyroid hormone autoantibodies. The case of a 69 year old woman with a spuriously high FT4 using the Amerlite MAB FT4 assay is reported. Laboratory investigations showed that her spurious FT4 result was likely to have been caused by anti-thyroid hormone autoantibodies.

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